I carry a Glock 27, the 40 caliber version of the 26. I have told friends to choose either a S&W model 36 or a Glock 43 for first gun. Both are reliable, effective and inexpensive to shoot (accept now when all ammo is scarce). I prefer a Relentless Tactical leather IWO holster.
When fishing, in back country, I carry a Charter Arms Bulldog 44 spl, with 265gr LSWC bullets or a S&W model 60 three inch 357 with hard cast 165 gr LSWC. My 5.11 pack has a hidden holster.
Practice often. Most people in a stressful situation will shoot maybe half as well as in practice. Practice reloading. Where you carry should be consistent. If you decided you are going to carry, always carry. Don’t tell people you carry. Resist the urge to check your clothing or adjust your holster in public. Look before you go out to see if your gun prints on your clothing. If you look, it is easy to tell who has a gun. Bad people do.
Good luck and stay safe.